<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
  new Promise((resolve, reject) => {
      setTimeout(() => {
          // resolve('Hello VueJs');
          reject('error message');
      })
  }).then(data => {
      console.log(data)
  }, err => {
      console.log(err)
  })
</script>
</body>
</html>